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By the Bose-Einstein statistics, the equations describing the spontaneous fluctuations of photon radiation are given. These equations are applied to the thermal photon radiation of a non homogeneous plasma. The fluctuations may be described by a degeneration factor μ which is calculated in general terms here and especially for an argon plasma in Part II. By using a highly sensitive photodetector which transforms radiation fluctuations into current fluctuations at its output, the degeneration factor μ can be determined. The properties of a cooled InSb-photodiode are then investigated. It is shown that this detector is useful for measuring photon noise at about 5 μ wavelength of an argon plasma. The actual measurements are given in Part II.

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Untersuchungen über die statistischen Schwankungen der infraroten Strahlung einer Hochdruck-Hochstrom-Argonentladung: Teil I. Spontane Strahlungsschwankungen eines nicht-schwarzen Strahlers und ihre Messung mit einer In-Sb-Photodiode